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6 Programming the control
6.8
Scaling machine data
6.8
Download scaling
machine data
6
Gradual downloading
of machine data
6-76
Scaling machine data
The machine data also includes data that defines the scaling of machine data in
relation to its physical unit (e.g. velocities).
This is in relation to the scaling for the following machine data, for example:
S
MD 10220: SCALING_USER_DEF_MASK (activates the scaling factors)
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MD 10230: SCALING_FACTORS_USER_DEF (scaling factors for the physi-
cal variables)
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MD 10240: SCALING_SYSTEM_IS_METRIC (basic system is metric)
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MD 10250: SCALING_VALUE_INCH (conversion factor for switching to the
INCH system)
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MD 30300: IS_ROT_AX (rotary axis)
When machine data is loaded (via HMI, RS-232 interface, program), it is scaled
according to the physical unit which is currently valid. If this record contains a
new scaling (e.g. a rotary axis declaration), then the machine data that is de-
pendent on the scaling will be converted to the new scaling at the next POWER-
ON. The MD then does not contain the expected values (e.g. rotary axis traver-
ses at very low F values).
Example:
The control was started up with default values. The MD file to be downloaded
defines the 4th axis as a rotary axis and contains the following machine data:
$MA_IS_ROT_AX[A1] = 1 (rotary axis)
$MA_MAX_AX_VELO [A1]= 1000 [rev./min] (maximum axis speed)
When the MD block is downloaded, the velocity is interpreted in relation to a
linear axis (default setting $MA_IS_ROT_AX[A1]=0 ) and scaled to the linear
velocity.
During the next Power-on process, the control detects that this axis is defined
as a rotary axis and normalizes the velocity with reference to rev/min. The value
in the machine data is then no longer "1000", but "2.77777778" (1000/360).
If the machine data file is downloaded again, the axis is already defined as a
rotary axis and the velocity is interpreted and scaled as a rotary axis velocity,
The MD then contains the value "1000" that is interpreted in rev/min by the con-
trol system.
Either
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Change the relevant machine data manually via HMI (MD 10220, 10230,
10240, 10250, 30300) and then power-up the NCK. Then read in the MD
record and trigger the NCK power-up, or
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Generate an MD record with the scaling machine data (MD 10220, 10230,
10240, 10250, 30300). Load this MD record and initiate an NCK power-up.
Then read in the complete MD record and trigger the NCK power-up, or
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Alternatively, an MD record may be downloaded twice, each time with an
NCK power-up.
© Siemens AG 2006 All Rights Reserved
SINUMERIK 840D/810D Start-Up Guide (IADC) – 03/2006 Edition
03/2006
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